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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Vertical stratification of K uptake for soybean-based crop rotation

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Author(s):
de Oliveira, Silas Maciel [1, 2] ; Dias, Danyllo Santos [1] ; de Borja Reis, Andre Froes [1] ; Silva Cruz, Simerio Carlos [3] ; Favarin, Jose Laercio [1]
Total Authors: 5
Affiliation:
[1] Univ Sao Paulo, Luiz de Queiroz Coll Agr, Crop Sci Dept, 11 Padua Dias Ave, BR-13418900 Piracicaba, SP - Brazil
[2] Univ Estadual Maringa, Dept Agron, 5790 Colombo Ave, Maringa, Parana - Brazil
[3] Goias Fed Univ, Dept Agron, Jatai Campus, 3800 BR 364, Km 195, BR-75801615 Jatai - Brazil
Total Affiliations: 3
Document type: Journal article
Source: NUTRIENT CYCLING IN AGROECOSYSTEMS; v. 117, n. 2 APR 2020.
Web of Science Citations: 0
Abstract

Soybean {[}Glycine max (L.) Merrill] is a major grain-legume used in rotation with cereal crops throughout the world. However, little is known about the soybean-based crop rotations effects on potassium (K) efficiency and its cycling capacity in soil. Therefore, a field study was carried out over 2 years to assess K cycling and which soil depth contributes to K uptake in first soybean crop as well as in the following crop rotation within the same rainfed growing season. Four rotations were evaluated, including (1) soybean-fallow, (2) soybean-ruzigrass (Brachiaria ruziziensis), (3) soybean-corn (Zea mays L.), and (iv) soybean-intercrop (corn and ruzigrass). Rubidium (Rb) was used as a K tracer and applied at the depths of 0, 0.3, and 0.6 m. For soybean, 60% of the K was taken up from the shallow soil layer, whereas the depths of 0.3 and 0.6 m accounted for 25 and 15%, respectively. In the second crop, ruzigrass monoculture and intercrop enhanced K uptake (41-302 kg ha(-1)) relative to the corn monoculture, and most of the K originated from a soil depth of 0.3-0.6 m, with average values of 40 and 34%, respectively. The K cycled from soybean residue contributed between 1 and 13% of the total nutrient cycling. In the soybean crop, most of the K was taken up from the upper soil layer. The soybean-intercrop rotation was the best pathway for allying the benefits of high K-cycling grass with the production of a cash crop. (AU)

FAPESP's process: 12/24226-5 - DYNAMICS OF NITROGEN IN SOIL-PLANT ENVIRONMENT IN FERTILIZATION SYSTEMS
Grantee:Silas Maciel de Oliveira
Support Opportunities: Scholarships in Brazil - Master